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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc2dec712899c88a6b48c8d82af1955b515c8cf51e796a201f1839d0c69b5658' 
  AND token = 'diwhfKkN2NCAhRr6SgoX3haQD6fuKspI6teaBDMat7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}